Hitachi Relion 670 Series Product Manual page 57

Phasor measurement unit RES670 1MRK 511 410-BEN P
Version 2.2
Wide area measurement system
GUID-F0BAEBD8-E361-4D50-9737-7DF8B043D66A v5
The IED is compliant with the synchrophasor measurement
requirements of IEEE C37.118.1-2011, including the
amendment (IEEE C37.118.1a-2014) for both P and M
performance classes. The IED is also compliant with
synchrophasor data transfer requirements of IEEE
C37.118.2-2011. There are two types of internal current
transformer cores in the IED, protection and measuring
cores. Using the measuring cores, the IED is compliant with
all the synchrophasor measurement requirements. If using
the protection core, for the "signal magnitude-current"
steady state test (mentioned in Table 3 of IEEE
C37.118.1-2011 standard), the compliancy to the standard
is limited to the current range between 50% and 200% of
rated current for both P and M classes of the standard. The
reason is that protection cores are not designed for
accurate measurements on low current levels.
The compliancy to IEEE C37.118.1-2011 standard
(including IEEE C37.118.1a-2014) is limited to the reporting
rates up to 60 frames per second which is required by the
standard. This means 10, 25, and 50 frames per second for
50 Hz system frequency and 10, 12, 15, 20, 30, and 60
frames per second for 60 Hz system frequency.
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